When my headlights are off the park lights and license plate lights flash when a turn signal is activated. With the headlights on all the lights function normally. For example, with the headlights off and left turn signal activated. The left turn signal blinks like it should AND the license plate light and right rear park lights blink also the right front 194 led will flicker very faint. My previous known good configuration was led's from vled everywhere inside and out except the third break, cargo and 3157's in the tails. I then installed led's in the third break light and four 3157's in the tails, also clipped the 7 pin on the stock flasher to prevent hyper flash. To trouble shoot I installed a new LM487 flasher that is comparable with led's, no change Put the stock 3157 bulbs back in the tails and unplugged the third break light, no change Unplugged all four connections from the distribution block by the spare tire and the factory trailer plug from the bumper at the same time, the front opposite 194 led of the selected turn signal will flash at normal brightness instead of a flicker. Took it to the dealer and they couldn't fix it. They said they cleaned some grounds and there guess is the taillight harness in the rear. How could a new taillight harness fix it if the problem still persists when the harness is unplugged? Can't really throw parts at this and hope for the best.